Rapid detection of TNT in aqueous media by selective label free surface enhanced Raman spectroscopy

Jamil, Arniza Khairani Mohd; Izake, Emad L.; Sivanesan, Arumugam; Fredericks, Peter M.

doi:10.1016/j.talanta.2014.12.022

Cited by 71 publications

(57 citation statements)

References 98 publications

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“…Frequently, they are silver or gold nanoparticles on a dielectric substrate. Additionally, laser ablation of copper [141], silver [142], or gold [143] in solution forms a colloidal, SERS-active solution, and has been used to detect ANTA, FOX-7, and TNT.…”

Section: Sersmentioning

confidence: 99%

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Advances in explosives analysis—part II: photon and neutron methods

et al. 2015

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The number and capability of explosives detection and analysis methods have increased dramatically since publication of the Analytical and Bioanalytical Chemistry special issue devoted to Explosives Analysis [Moore DS, Goodpaster JV, Anal Bioanal Chem 395:245-246, 2009]. Here we review and critically evaluate the latest (the past five years) important advances in explosives detection, with details of the improvements over previous methods, and suggest possible avenues towards further advances in, e.g., stand-off distance, detection limit, selectivity, and penetration through camouflage or packaging. The review consists of two parts. Part I discussed methods based on animals, chemicals (including colorimetry, molecularly imprinted polymers, electrochemistry, and immunochemistry), ions (both ion-mobility spectrometry and mass spectrometry), and mechanical devices. This part, Part II, will review methods based on photons, from very energetic photons including X-rays and gamma rays down to the terahertz range, and neutrons.

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Section: Sersmentioning

confidence: 99%

“…They successfully separated and characterized DNB and 2,4-DNT. Jamil et al [143] used a colloidal solution of gold nanoparticles with cysteamine in solution to increase selectivity. The cysteamine and TNT formed a Meisenheimer complex, which was then spontaneously assembled onto the gold nanoparticles and could be detected by SERS.…”

Section: Sersmentioning

confidence: 99%

Advances in explosives analysis—part II: photon and neutron methods

et al. 2015

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“…AHT:TNT complex was prepared similar to the reported procedure for other primary amines and TNT [29,44]. Briefly, AHT stock solution (2 × 10 −4 M) was prepared in MilliQ water and the pH is adjusted to 8.5.…”

Section: Preparation Of Meisenheimer Complex With Tntmentioning

confidence: 99%

“…A wide range of primary amines has been used for TNT recognition since primary amines effectively form Meisenheimer complexes with this nitro aromatic compound. For example, cysteine [25,26], aminothiophenol [1,27], BSA [28] and cysteamine [29,30] have been used as selective TNT recognition molecules. In the present work, we have chosen 6-aminohexanethiol (AHT) as a potential selective TNT recognition molecule.…”

Section: Introductionmentioning

confidence: 99%

“…This shorter backfill molecule also acts as a spacer molecule such that it will create enough space between the AHT molecules and provides easy access to TNT to bind, via the AHT bridge, in an almost perpendicular orientation to the SERS substrate [29,[36][37][38]. It has been demonstrated in the literature that, high SERS enhancement is realized when the molecule's Raman vibrations have large component of polarizability in the direction normal to the SERS surface [29,39,40]. On the other hand, the least enhanced modes are those whose Raman tensor components involve the two axes in the plane of the surface [37].…”

Section: Introductionmentioning

confidence: 99%

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Molecular recognition of 2,4,6-trinitrotoluene by 6-aminohexanethiol and surface-enhanced Raman scattering sensor

Jamil

Sivanesan

Izake

et al. 2015

Sensors and Actuators B: Chemical

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TNT) sensor 6-Aminohexanethiol (AHT) and mixed monolayer Surface-enhanced Raman spectroscopy (SERS) Electrochemical desorption and X-ray photoelectron spectroscopy (XPS) Analysis of explosives in soil a b s t r a c t 2,4,6-Trinitrotoluene (TNT) is one of the most commonly used nitro aromatic explosives in landmine, military and mining industry. This article demonstrates rapid and selective identification of TNT by surface-enhanced Raman spectroscopy (SERS) using 6-aminohexanethiol (AHT) as a new recognition molecule. First, Meisenheimer complex formation between AHT and TNT is confirmed by the development of pink color and appearance of new band around 500 nm in UV-vis spectrum. Solution Raman spectroscopy study also supported the AHT:TNT complex formation by demonstrating changes in the vibrational stretching of AHT molecule between 2800 and 3000 cm −1 . For surface enhanced Raman spectroscopy analysis, a self-assembled monolayer (SAM) of AHT is formed over the gold nanostructure (AuNS) SERS substrate in order to selectively capture TNT onto the surface. Electrochemical desorption and Xray photoelectron studies are performed over AHT SAM modified surface to examine the presence of free amine groups with appropriate orientation for complex formation. Further, AHT and butanethiol (BT) mixed monolayer system is explored to improve the AHT:TNT complex formation efficiency. Using a 9:1 AHT:BT mixed monolayer, a very low detection limit (LOD) of 100 fM TNT was realized. The new method delivers high selectivity towards TNT over 2,4 DNT and picric acid. Finally, real sample analysis is demonstrated by the extraction and SERS detection of 302 pM of TNT from spiked. Crown

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Photonics for Explosives Detection

Soma

Shaik

Moram

2019

Digital Encyclopedia of Applied Physics

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In this article, we present an overview of the various photonic aspects involved in different techniques for explosives detection on field and in the lab. We confine this synopsis to only laser‐based techniques for detecting explosive molecules in point or proximal setup (laser source and detectors are in the proximity of sample) and in standoff mode (laser and detectors are at certain distance from the sample). The techniques considered in this overview are (a) laser‐induced breakdown spectroscopy (LIBS), (b) Raman spectroscopy and its variants [surface‐enhanced Raman spectroscopy (SERS), coherent anti‐Stokes Raman spectroscopy (CARS), and spatial offset Raman spectroscopy (SORS)], (c) terahertz (THz) spectroscopy, and (d) photoacoustic spectroscopy (PAS). Various photonic aspects related to these techniques such as (i) laser sources used and the future requirements, (ii) detectors employed at present and improvements required, (c) design and advances in variety of optics used for illuminating, collimating, collecting, focusing, etc., and (d) integration of all these components for the creation of efficient portable devices for explosives detection in the laboratory and field are discussed in detail. We also present results obtained through some of our efforts toward trace and standoff explosives detection using SERS and femtosecond LIBS techniques, respectively.

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Rapid detection of TNT in aqueous media by selective label free surface enhanced Raman spectroscopy

Cited by 71 publications

References 98 publications

Advances in explosives analysis—part II: photon and neutron methods

Advances in explosives analysis—part II: photon and neutron methods

Molecular recognition of 2,4,6-trinitrotoluene by 6-aminohexanethiol and surface-enhanced Raman scattering sensor

Photonics for Explosives Detection

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